Monte Fitz Roy, El Chaltén: The Only Trek You Need to Doargentina, blog, south america, travel / By GenR This is a photo gallery. The whole trek takes a day to complete, when you don’t rush to get nowhere. It is usually packed with people. El Chalten Fitz Roy trek: depart 8:30, return 19:00. Laguna de los tres. 22 km aller-retour, 1068 m elevation.